英语语法大全
英语语法在英语学习中也是很重要的，它可以让你了解英语的结构。下面是学习啦小编给大家整理的英语语法，供大家参阅!
英语语法：than用法的七个关键要点
than用法的七个关键要点
1. 在通常情况下，后接人称代词时可用主格也可用宾格，含义一样。如：
He is taller than I [me]. 他比我高。
He swims faster than she [her]. 他比她游泳游得快。
若人称代词之后跟有动词，则只能用主格。如：
He is taller than I am. 他比我高。
He swims faster than she does. 他比她游泳游得快。
有时用主格或宾格会导致意思的变化。比较：
I like you better than he (likes you). 我比他更喜欢你。
I like you better than (he likes) him. 我喜欢你胜过喜欢他。
2. 通常不与由 and 连接的两个比较级连用。如：
误：It’s colder and colder than ever
误：Computers are cheaper and cheaper than before.
误：She is more and more interested in English than last year.
改正的办法：要么去掉后面的than结构，要么将and与一个比较级。如说成：It is colder than ever. 或 It is colder and colder. 等。
3. than 通常用于两个不同的人或物在同一方面进行比较，但有时指的可能是同一个人或物在同两个不同的方面进行比较。如：
He’s more fat than (he’s) short. 与其说他矮不如说他胖。
They are more brave than wise. 他们有勇无谋。
此类结构只能用 more 构成比较级，不能用-er 形式，即使是单音节也是如此。
4. than any other后接名词时通常用单数形式，很少用复数。如：
He swims faster than any other student in his class. 他比班上的其他任何学生都游得快。
5. 当连接两个非谓语动词时，通常应保持用前后一致的形式。如：
他认为他自己开车比让我开车要更安全些。
正：He thinks it is safer to drive himself than (to) let me drive.
正：He thinks that driving himself is safer than letting me drive.
若不是连接两个非谓语动词，但其后出现有动词，则该动词通常用动名词(虽然也可用不定式，但不如用动名词普通)。如：
I cleaned my shoes, which was better than doing nothing. 我把鞋子擦干净了，这比闲着什么都不干要好。
Nothing is more unpleasant than finding [to find] insects in your bath. 最使人不快的是在浴室里发现有虫子。
5. 类似以下这类句子，可以认为 than就是这类句子主语，也可认为than后省略了what：
He never says more than is necessary. 没有必要的话，他从不多说。
There were more deaths than was first supposed. 死亡人数比最先预料的要多。
有时这类句子的省略可以多种形式，且有时其主语可补充完整。如：
他比预料的要来得早。
正：He came earlier than expected.
正：He came earlier than was expected.
正：He came earlier than he was expected.
6. 带有never (a) 的比较级结构后连用了than时，是一种强调说法，通常表示最高级的含义。如：
I’ve never had a worse morning than today. 我哪一天早上也不像今天早上这样倒霉。
若意思明确，有时可省略than结构。如：
He is fine, never better. 他很好，比以往任何时候都好。
I’ve never found a better job. 这是我找到的最好的工作。
7. 若语义需要，有时可后接when, if等引导的从句。如：
You are a little fatter than when I saw you last. 你比我上次见你时胖点了。
They work better together than if they are alone. 他们一起干比他们单干效果要好。
有时还可接没有任何引导词的句子。如：
The game was closer than the score suggests. 实际的比赛与所得的分数相比更难分高下。
英语语法：as的用法详解
A. adv. to the same degree or amount; equally 同样地，一样地
He was angry, but she was just as angry.
=She was as angry as he was.
他生气了，但她同样生气。
He has a lot of time but I don’t have as much (as he does).
=I have less time than he has.
他有很多时间，但我没有那么多。
B. prep.
(1) in the same way as; like像，如同
Everyone rose as one.
=everyone rose together.
大家一起同时起立。
I only like such small animals as cats and dogs. 我只喜欢像猫和狗一类的小动物。
as和like在汉语中都译做“像”，但字面下的隐含意思是不同的。
like侧重A与B两者间的比较，并不意味着A和B属于一类或完全相似。
He speaks English like an Englishman.
=He speaks English in a way an Englishman speaks English.
他说起英语来有些像英国人。
as则侧重于同一性，意味着A与B两者属于同一类或完全相似。
He speaks English as an Englishman.
=He speaks English as well as an English.
他说起英语来和英国人一样好。
She was dressed as a man. 她打扮成了男人。(俨然她就是个男人了)。(相同事物)
She was dressed like a man. 她像男人那样穿衣服(依然可见她是个女人)。(不同事物)
(2) in the capacity/job/role/character/condition/function of以...身份，以...为职业，扮演...角色，具有...特性，在...状态下，起...功能/作用
As a schoolboy, he showed every sign of genius. 当他还是个小学生的时候，就显示出了天资聪慧。
The forest will act as a defense against desert dust. 森林能起防御沙漠灰沙的作用。
The news came as no surprise. 这消息来得并不突然。
The man was described as tall and dark, and aged about 20. 据描述这男人高个子，深色皮肤，年龄在20岁左右。
They regarded the lecture as boring. 他们认为讲座很乏味。
Many people use education as a steppingstone to a better life.许多人将教育作为赢得更好的生活的手段。
Marion works as a journalist. 马里恩的职业是新闻工作者。
I used to look on him as a friend. 我以前把他看作是一位朋友。
C. conj.
(1) to the amount or degree that 像...一样(引导比较状语从句)
The fabric was as soft as silk. 那件织品软得像丝绸。
(2) in the way in which 以...方式，如同...那样(引导表语从句和方式状语从句)
It is as you told me. 事情正如你告诉我的那样。
Do in Rome as the Romans do. 入乡随俗。
(3) in spite of the fact that, though虽然，尽管(引导让步状语从句)
(a) adj./v-ed2/v-ing+as+主语+系动词。如：
Oldest as he is in the office, he works hardest.尽管他是办公室里年龄最大的，他工作最努力。
注意：adj./adv.最高级前应省去定冠词the。
Well-written as the book is, the author is not satisfied and prepared to revise it.尽管这本书写得很好，作者还是不满意并打算修改它。
(b) adv.+as+主语+谓语部分。如：
Much as I admire his courage, I don’t think he acted wisely.我虽然崇拜他的勇气，但我认为他这样做是不明智的。
(c) n./pron.+as+主语+系动词。如：
Student as he is, he does not study hard.他虽然是个学生，却不努力学习。
You can use my bike, such as it is. 尽管我的自行车不好，请将就用吧。
注意：单形可数n.[c, s]前应省去冠词a(n)。
(d) 动词原形+as+主语+谓语的其它部分(时态助动词/情态动词)。如：
Try as you will, you won’t be able to persuade him.不管你怎么努力，你都说服不了他。
(4) at or during the time that; when; while当...的时候;随着...(引导时间状语从句)
He slipped as he was walking to his car. 当他走向车子时，他摔倒了。
He became stout as he grew older. 随着年龄的增长，他发胖了。
(5) for the reason that; because, since因为(引导原因状语从句)
She may need some help as she's new. 他可能需要帮助，因为他是新手。
英语语法：opposite用法分述
该词有多种词性，使用时需注意。
1. 用作介词，表示“在……对面”：如：
The hotel is opposite the church. 旅馆在教堂对面。
Hang the picture on the wall opposite the window. 把画挂在窗户对面的墙上。
I sat opposite him during the meal. 席间我坐在他的对面。
有时其后还可连用介词to构成复合介词。如：
He sat opposite (to) her during the meal. 吃饭的时候他坐在她的对面。
注意，住在街道一边的人在谈到街道另一边的房子时应该说the houses opposite us(我们对面的房子)，而不说the houses in front of us，后者的意思是“在我们前面的房子”。
2. 用作形容词，注意以下用法：
(1) 表示“对面的”，若指的是某事物的另一边(on the other side of)，则通常用于名词前作定语。如：
He struck out for the opposite bank. 他奋力向对岸游去。
Answers are given on the opposite page. 答案在对面一页上。
但是，若指的是面对说话人、听话人或某个特定的人或物，则习惯上要用于名词后作定语。如：
The man you are looking for is in the shop directly opposite. 你找的那个人就在对面的商店里。
Can you see where the grammar books are? The dictionaries are on the shelf directly opposite. 你看见语法书在哪儿呢吗? 词典都在正对着的书架上。
比较下面两个句子：
He lives in the opposite house. 他住在街对面的房子里。
He lives in the house opposite. 他住在对面的那座房子里。
(2) 表示“完全不同的”“相反的”，若指“与……相反”，通常与介词to搭配。如：
She went off in the opposite direction. 她往相反的方向走了。
I’ve got exactly the opposite opinion to yours. 我的意见和你的正相反。
注意习语the opposite sex(异性)。如：
He found it difficult to talk to members of the opposite sex. 他觉得很难与异性交谈。
3. 用作副词，表示“在对面”。如：
He was fascinated by the woman sitting opposite. 他被坐在对面的女士迷住了。
The window was broken by the boy who lives opposite. 窗户被住在对面的那个男孩打破了。
4. 用作名词，有两个意思是一是表示“反义词”，二是表示“对立的事物”“相反的事物”，为可数名词。如：
Black and white are opposites. 黑白是对立物。
But everything has an opposite. 但一切都有相反的一面。
You are nice; he is just the opposite. 你为人很好，他却恰恰相反。
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